Pest identification
What's eating my bishop's cap cactus?
Mealybugs
Signs: White cottony masses at the areoles and between ribs, easily confused with the plant's natural white flocking
Control: Touch suspected patches with a 70% isopropyl alcohol swab — pests dissolve, natural trichomes do not; follow with neem oil
Scale insects
Signs: Hard, slightly raised tan bumps fixed to the rib surfaces; plant body yellows around attachment points
Control: Gently remove with a soft toothbrush and soapy water; apply horticultural oil spray; repeat every 2 weeks for 6 weeks
Root mealybugs
Signs: Plant shrinks or collapses despite good watering and light; white waxy deposits discovered when the root ball is inspected
Control: Unpot and inspect roots; treat with a neem drench or systemic drench; repot in dry, gritty cactus compost
Keep bishop's cap cactus pest-free
Healthy plants resist pests best. Get the basics right:
Bishop's Cap Cactus pests — FAQ
What is eating my bishop's cap cactus?
Bishop's Cap Cactus (Astrophytum myriostigma) is a spineless, star-shaped houseplant covered in white scale-like trichomes. These trichomes can mask early mealybug and scale insect infestations. Root mealybugs are a hidden risk. The lack of spines means pests can attach anywhere on the body without obstruction.
How do I get rid of mealybugs on bishop's cap cactus?
White cottony masses at the areoles and between ribs, easily confused with the plant's natural white flocking Touch suspected patches with a 70% isopropyl alcohol swab — pests dissolve, natural trichomes do not; follow with neem oil
How do I get rid of scale insects on bishop's cap cactus?
Hard, slightly raised tan bumps fixed to the rib surfaces; plant body yellows around attachment points Gently remove with a soft toothbrush and soapy water; apply horticultural oil spray; repeat every 2 weeks for 6 weeks
How do I get rid of root mealybugs on bishop's cap cactus?
Plant shrinks or collapses despite good watering and light; white waxy deposits discovered when the root ball is inspected Unpot and inspect roots; treat with a neem drench or systemic drench; repot in dry, gritty cactus compost